The Spinning rotor gauge technology (SRG) allows the precise pressure measurement of the insulation vacuum from outside the vessel. Only the simple pressure sensor, a ball in a stainless steel tube, is connected/welded to the vacuum vessel and stays there, well protected, for the lifetime of the chamber.
The sensing head/readout is mounted on demand and delivers pressure values form 10 to 1×10-6 mbar just by using electromagnetic forces.
SRG technology has now been used for more than three decades in vacuum calibration labs as a transfer standard. Previously, SRG systems were considered complex to operate and were therefore almost exclusively used in laboratories. That meant a main application of this technology was in the calibration of high vacuum measuring devices, for example in Ion or Pirani gauges (10-3 to 5 x 10-7 mbar).
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